Insights

Sustainable Practice Guernsey emphasizes sustainable practices and integrated design across architecture, engineering, environmental planning, and transportation planning. This positions them to pursue opportunities with clients prioritizing green building certifications, energy efficiency, and resilient infrastructure.

Cybersecurity Expansion With a stated focus on cybersecurity solutions and recent CMMC certification services, Guernsey can target government contractors and defense-related firms that require compliance and security maturity assessments, expanding beyond traditional design services.

Strategic Partnerships Recent collaborations with HoganTaylor and Siemens indicate a market strategy centered on alliances to broaden service offerings in cybersecurity, energy strategy, and comprehensive planning, suggesting joint value propositions for large public and private clients.

Global Reach Operating on five continents with a broad service mix signals capability to support multinational clients and complex, cross-border projects, which appeals to firms undergoing global expansion, campus redevelopments, or multi-site infrastructure programs.

Growth and Talent New leadership hires in marketing and business development and a steady expansion of architectural and corporate teams indicate investment in market visibility and client acquisition, creating opportunities for solution selling, brand positioning, and targeted account campaigns.

Guernsey Tech Stack

Guernsey uses 8 technology products and services including iCIMS, Cloudflare, SQL, and more. Explore Guernsey's tech stack below.

  • iCIMS
    Applicant Tracking Systems
  • Cloudflare
    Content Management System
  • SQL
    Database
  • Microsoft SQL Server
    Database
  • jQuery Migrate
    Javascript Libraries
  • HTML
    Programming Languages
  • NIST Special Publications
    Risk And Compliance
  • SEOmatic
    Search Engines

Media & News

Guernsey's Email Address Formats

Guernsey uses at least 1 format(s):
Guernsey Email FormatsExamplePercentage
First.Last@guernsey.usJohn.Doe@guernsey.us
98%
LastFirst@guernsey.usDoeJohn@guernsey.us
1%
F.Last@guernsey.usJ.Doe@guernsey.us
1%

Frequently Asked Questions

What is Guernsey's phone number?

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You can contact Guernsey's main corporate office by phone at . For more prospecting data, LeadIQ has access to up-to-date and accurate contact information within our platform. Find, capture, and sync contact data to your CRM and sales tools in one click.

What is Guernsey's stock symbol?

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Guernsey is a publicly traded company; the company's stock symbol is SIGB.L.

What is Guernsey's official website and social media links?

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Guernsey's official website is guernsey.us and has social profiles on LinkedIn.

What is Guernsey's NAICS code?

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Guernsey's NAICS code is 54131 - Architectural Services.

How many employees does Guernsey have currently?

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As of July 2026, Guernsey has approximately 163 employees across 4 continents, including North AmericaEuropeAfrica. Key team members include Vice President Energy & Utility Solutions: H. A.President: H. G.President: J. B.. Explore Guernsey's employee directory with LeadIQ.

What industry does Guernsey belong to?

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Guernsey operates in the Architecture and Planning industry.

What technology does Guernsey use?

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Guernsey's tech stack includes iCIMSCloudflareSQLMicrosoft SQL ServerjQuery MigrateHTMLNIST Special PublicationsSEOmatic.

What is Guernsey's email format?

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Guernsey's email format typically follows the pattern of First.Last@guernsey.us. Find more Guernsey email formats with LeadIQ.

When was Guernsey founded?

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Guernsey was founded in 1928.
Guernsey logo

Guernsey

Architecture and PlanningOklahoma, United States51-200 Employees

Guernsey is a mid-sized, multidisciplinary design and consulting firm based in Oklahoma City, Oklahoma. Founded in 1928, it operates on five continents and offers a broad mix of architecture, engineering, economic and management consulting, environmental and transportation planning, and cybersecurity services. The firm emphasizes sustainability and aims to improve the built environment through integrated, cross-disciplinary work, and it is fully owned by its employees, reflecting an entrepreneurial, culture-driven approach. Guernsey serves clients across diverse industries with planning, design, and advisory capabilities that address complex infrastructure needs. Recent developments include collaborations with Siemens on electricity strategy, with HoganTaylor LLP to expand cybersecurity maturity services, and a city planning engagement with the City of Cushing.

Section iconCompany Overview

Phone number
Stock Symbol
SIGB.L
NAICS Code
54131 - Architectural Services
Founded
1928
Employees
51-200

Section iconFunding & Financials

  • $100M$250M

    Guernsey's revenue is estimated to be in the range of $100M$250M

Section iconFunding & Financials

  • $100M$250M

    Guernsey's revenue is estimated to be in the range of $100M$250M

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